Includes D200 USB-A adapter. Wireless range up to 300ft. Wireless headset that can be worn three different ways to match your personal preference : Over-the-ear, over-the-head or behind-the-head. DECT 6.0 technology provides best-in-class audio; eliminates interference from Wi-Fi. With one-touch call answer/end, vol+/-, mute and flash, switch between softphone calls for simple call management. Up to 7 hours of talk time, 30 hours standby. SoundGuard® technology elimate against audio spikes. An energy-efficient approach to power usage, with an adaptive power system, delivers longer talk and standby times. Sold by each. Black.